Integration of Geoelectrical Methods in the Diagnostic Ofa Diesel Contaminated Site in Santa Ernestina (Sp)

Veloso, Dimitri Ilich Kerbauy; Moreira, César Augusto; Côrtes, Ariane Raissa Pinheiro

doi:10.22564/rbgf.v33i4.760

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Values close to 20 Ω m are a sign of AMD-impacted waters, whereas resistivity values around 80 Ω m might be related to zones with lower salinity, at levels expected for natural waters. These resistivity values are compatible to those obtained by [46,65,67]. Areas with resistivity values between 80 and 150 Ω m indicate streams associated with a natural or uncontaminated ground flow, in contrast with resistive anomalies (> 150 Ω m) associated with the alkaline bedrock, with varying weathering degrees, and the waste rock material that composes the pile.…”

Section: Resultssupporting

confidence: 87%

“…Subsequently, the generation of 3D visualization models was made through the use of Oasis Montaj Platform (Geosoft), whose process of interpolation of the previous 2D geophysical products is based on the methods of kriging and minimum curvature, designed to guarantee the smoothing of the central values concerning the limits of the investigated area. The use of this kind of model, frequently applied in mineral prospection researches [62][63][64], makes possible a broad analysis of the hydrogeological conditions of the study area, including the identification of preferential groundwater pathways in the context of fractured and porous aquifer systems and delimitation of contamination plumes during the stages of characterization and monitoring of impacted sites [65][66][67].…”

Section: Methodsmentioning

confidence: 99%

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Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

et al. 2020

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Mining activities are known for the profound changes they cause in the environment, especially those related to environmental liabilities generated by these enterprises. One major concern of this sector relies on the acid mine drainage (AMD) process, which is formed by the exposure of sulfide minerals to oxidizing conditions. As a result, the production of low-pH saline waters favors the mobilization of heavy metals to the environment. In the last decades, the characterization and monitoring of contamination plumes have become more feasible due to the application of geophysical tools, more precisely the DC resistivity geophysical method. Thus, the aim of the present study is the application of electrical resistivity tomography to understand the hydrogeological dynamic of a waste rock pile in the Osamu Utsumi uranium mine, with the identification of preferred groundwater and AMD flow. The analysis of the 2D geophysical products allowed the differentiation of high salinity water accumulation zones (< 40 Ω m) in the interior of the pile. Likewise, the evaluation of the pseudo-3D model generated by the interpolation of 2D sections was crucial for the recognition of low resistivity zones within the bedrock, possibly controlled by fractures that work as recharge zones between the waste rock pile and the fractured aquifer. The identification of discharge and recharge zones related to the fractures system is a fundamental step for planning and actions to prevent water-sulfides interaction process, which is responsible for the generation of AMD, and also the installation of groundwater pumping systems.

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Section: Resultssupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

et al. 2020

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“…Sulfide minerals, once isolated in subsurface, and the reaction with atmospheric oxygen in the presence of water produce low pH effluents with high concentrations of metals and metalloids, a process known as acid mine drainage (AMD) (Akcil & Koldas, 2006). The detection and monitoring of water that is rich in salts dissolved in the subsurface successfully employ geophysical electrical and electromagnetic methods, together with the traditional direct approach of investigation, like monitoring wells, ensuring success in different researches (Silva et al, 2009;Veloso et al, 2015;Helene et al, 2016;Moreira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Integration of Geophysical Methods in the Study of Acid Drainage in Uranium Mining Waste

Casagrande¹,

Moreira²,

Targa³

et al. 2018

Braz J Geophys

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ABSTRACT. Among the potential environmental impacts in mining activities, acid mine drainage (AMD) is a relevant problem caused by reactive minerals, such as sulfides, due to their exposure to the surface conditions. This is the context of contamination of a waste pile (BF-04) at Osamu Utsumi mine, closed in 1995 after years of physical and chemical processing of the uranium ore and currently under decommissioning plan. This study is based on the application of the combined geophysical methods of Electrical Resistivity and Induced Polarization and the analysis of previous geochemical data, aiming the evaluation of zones related to the generation of AMD and groundwater flux into the waste pile BF-04, containing sulfide minerals and uranium. The association of high resistivity and high chargeability zones is related to disseminated sulfide minerals in rock with silica cement. Infiltration of meteoric water through those zones induces the oxidation of sulfides, high sulfur concentration in groundwater followed by a drop in pH values, which results in a higher leaching capacity and solubility of ions and heavy metals. In addition, high chargeability zones (higher than 10 mV=V) represent portions of generation of AMD, while the low resistivity anomalies (under 70W:m) are related to preferential flow zones of the contaminated groundwater.Keywords: minning, sulfides, uranium, electrical resistivity, chargeability.RESUMO. Dentre os potenciais impactos ambientais em mineração, a drenagem ácida de mina (DAM) é um problema grande onde ocorrem minerais instáveis como os sulfetos, outrora isolados em subsuperfície. É neste contexto de contaminação do meio físico que está inserido uma pilha de rejeitos (BF-04) pertencente à mina de urânio Osamu Utsumi, cujas atividades de mineração, processamento físico e processamento químico foram encerradas em 1995, seguidas pela etapa de descomissionamento até os dias atuais. Neste estudo foram aplicados os métodos geofísicos da Eletrorressitividade e Polarização Induzida combinados com dados geoquímicos prévios, com o intuito de avaliar zonas de geração e fluxo de drenagem ácida de mina na pilha de rejeitos de mineração BF-04 com sulfetos e urânio. A combinação de zonas de alta resistividade e alta cargabilidade revela sulfetos disseminados em rochas com cimento silicático. A infiltração de águas meteóricas nestes locais induz a oxidação de sulfetos, liberação de enxofre nas águas subterrâneas seguida pela queda no pH, que resulta num efluente com alta capacidade de lixiviação e solubilidade de sais e metais. Neste sentido, zonas de alta cargabilidade (acima de 10 V=V) representam locais de geração de drenagem ácida de mina, enquanto que zonas de baixa resistividade (abaixo de 70 W:m) revelam zonas preferenciais de fluxo do efluente.Palavras-chave: mineração, sulfetos, urânio, resistividade, cargabilidade.

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“…The hydrocarbons have high resistivity in the free phase; however, factors such as the production of organic acids during the biodegradation cause a decrease in resistivity values. Several case studies involving electrical methods demonstrate the effectiveness, benefits and limitations when applied to the diagnosis and monitoring of contamination by hydrocarbons (Sauck, 2000;Batayneh, 2005;Moreira et al, 2006;Delgado-Rodríguez et al, 2006;Menezes et al, 2011;Porciúncula & Lima, 2012;Delgado-Rodríguez et al, 2014;Veloso et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Dc Resistivity Method Applied in the Monitoring of Diesel Leakage in a Railway Accident in São Manuel City, São Paulo State (Brazil)

Moreira¹,

Helene²,

Côrtes³

2017

Rev. Bras. Geof.

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ABSTRACT. This paper presents an integrated analysis of geochemical and geophysical data in a contaminated site by a leakage of 240.000L of diesel in 1999, currently under environmental monitoring. The main objective is to assess the presence of contaminants in residual and dissolved phase in the subsurface, using the technique of Electrical Resistivity Tomography (ERT), understand the effects of natural attenuation process in the degradation of hydrocarbons and changes in electrical properties in soil and groundwater. The results allowed for the definition of two distinct patterns of resistivity in region with presence of dissolved phase, defined in a historical of chemical analyzes. The intermediate values (260Ω.m and 511Ω.m) are indicative of the coexistence of hydrocarbons in residual and dissolved phase. The region of high values (>1000Ω.m) reveal the prevalence of residual phase with incipient degradation, possibly in concentrations of high toxicity for effective action of the biodegradation processes. The generation of 3D visualization models from 2D sections allows the use of the isosurface modeling technique and definition of a high resistivity body, consistent with conceptual models of hydrocarbons dispersion in the subsurface. The diagnostic of an area with potential accumulation of hydrocarbons in residual phase can subsidize the planning of remediation techniques and promote the complete attenuation of the area. Keywords: contamination, hydrocarbons, residual phase, dissolved phase, electrical resistivity tomography. RESUMO. Este trabalho realiza uma integração de dados geoquímicos e geofísicos obtidos numa área contaminada pelo vazamento de 240.000L de diesel em 1999, atualmente sob monitoramento ambiental. O principal objetivo é a verificação da presença de fases residual e dissolvida de contaminantes em subsuperfície, por meio da técnica de tomografia elétrica (ETR), para compreensão dos efeitos do processo de atenuação natural na degradação de hidrocarbonetos e alterações em propriedades elétricas do solo e águas subterrâneas. Os resultados permitiram a definição de dois padrões distintos de resistividade numa região com presença de fase dissolvida, definido a partir do histórico de análises químicas. Valores intermediários (260Ω.m e 511Ω.m) são indicativos da coexistência de hidrocarbonetos em fases residual e dissolvida. A região de elevados valores (>1000Ω.m) indica a prevalência de fase residual com degradação incipiente, possivelmente sob concentrações altamente tóxica para uma ação efetiva dos processos de biodegradação. A geração de modelos de visualização 3D a partir das seções 2D, possibilitaram o uso da técnica de modelagem de isosurperfície e definição de um corpo de alta resistividade, consistente com modelos conceituais de dispersão de hidrocarbonetos em subsuperfície. O diagnóstico de uma região com potencial acúmulo de fase residual de hidrocarbonetos pode subsidiar o planejamento de técnicas de remediação e propiciar a completa descontaminação da área. Palavras-chave: contaminação, hidrocarboneto, fase residual, fase dissolvida, tomografia elétrica.

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Integration of Geoelectrical Methods in the Diagnostic Ofa Diesel Contaminated Site in Santa Ernestina (Sp)

Cited by 5 publications

References 9 publications

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

Integration of Geophysical Methods in the Study of Acid Drainage in Uranium Mining Waste

Dc Resistivity Method Applied in the Monitoring of Diesel Leakage in a Railway Accident in São Manuel City, São Paulo State (Brazil)

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